Apparatus for heading nails or tacks.



A. H. BRIGHAM.

APPARATUS FOR HBADING NAILS OR TACKS.

APPLICATION FILED MAYBE, 1013.

1,105,61 3, Patented Aug. 4, 1914.

\ m 23 I l Witnesses. Inventor.

" %Wwz Albert HBrighum WWMM yz'wzflmwfi Atty's.

'I'Hb NORRIS PETERS CO, PNOTO-LITHQ. WA$HINGTON. D4 Cv ALBERT H. BRIG-HAM, OF 'WHITMAN, MASSACHUSETTS.

APPARATUS FOR HEADING NAILS OR TACKS.

Specification of Letters Patent.

Patented Aug. 4;, 1914.

Application filed May 26, 1913. Serial No. 769,812.

To all whom it may concern:

Be it known that I, ALBERT II. BRTG'HAM, a citizen of the United States, residing at Whitman, county of Plymouth, State of Massachusetts, have invented an Improvement in Apparatus for Heading Nails or Tacks, of which the following description, in connection with the accompanying draw ing, is a specification, like characters on the drawing representing like parts.

My invention relates to an apparatus for heading nails, tacks or the like and is an improvement over the devices shown in my rior Patents Nos. 589,495, 658,203 and 22,669. Said devices include a heading pin and a die movable relative thereto and a cliecarrier which guides the die and in which the heading pin is secured by means of a holder. In these devices the heading pin is necessarily without lateral support at the moment of greatest strain for a short distance back of the die and consequently breaks at this point because of a transverse strain due to the deflection or cramping of the die.

One of the objects of this invention is to prevent this breakage and this is accomplished by accurately centering the heading pin in the die-carrier, making the die of such a shape that it may have a long bearing in the carrier and by telescopically connecting the die and the holder by which the heading pin is secured in the die carrier insuring perfect alinement of the die and heading pin in all positions.

Other objects will appear from the following specification and the novel features will be pointed out in the claims.

In the drawing in which my invention is illustrated, Figure 1 is a sectional view showing the heading tool in position in the heading lever; Fig. 2 is a longitudinal sectional view of the heading tool drawn to a larger scale part being broken away; Fig. 3 is a section on the line 3-3 of Fig. 2; Fig. 4 is a section on the line 4% of Fig. 2; and Fig. 5 is a perspective view of the tapered split holder.

Referring to the drawings in detail 1 indicates the heading lever in which the heading tool 2 is adjustably mounted. This tool is clamped in place by the set-screw 3 between which and the tool a late 4 is inserted. The tool may be adjusted longitudinally and held in adjustable position by the thrust-screw 5.

6 and 7 represent the gripping dies between which the blank nail or tack is held while the 'head is being formed. These dies are of usual construction having suitable depressions or seats to shape the under side of the head. The heading tool comprises a diecarrier 8, a die 9 slidably connected therewith, and a heading pin 10 secured in the die-carrier and slidahle in the die.

In accordance with my present invention, the die-carrier is longitudinally bored, the bore being shaped to provide a cylindrical portion 11 in which the die is mounted and a tapered portion 12 into which the holder 13 is forced to secure the heading pin 10 in position. This holder 13 as shown in Fig. 5 is provided with slots 14., preferably three, which extend nearly the full length of the holder to divide it into a plurality of flexible members 15. The holder is made cylindrical at one end as shown at 16 to provide a proper bearing for the die and it is not split at this point. This form of holder insures an accurate centering of the heading pin and is an improvement over the form shown in my Patent N 0. 722,669 above mentioned, see Figs. 3 and 5 thereof, in which the set-screw presses against the holder and tends to force it out of true central position and in which the size of the holder, which is split, varies at the point where the die engages it.

The die 9 is substantially cylindrical with the central bore 18 and an annular recess 19. Saidv die fits as tightly in the cylindrical portion of the bore as is consistent with its sliding movement and has a long bearing therein, preferably considerably longer than the diameter of the die. In order to further insure accurate alinement of the die 9 with the holder 13 through both of which the heading pin extends, I recess the end of the die as at 20 so that it will receive the cylindrical end 16 ot' the holder and fit thereon with a rather tight sliding tit. This die extends some little distance beyond the end of the die-carrier in order that as the die wears the end of the die and heading pin may be ground off to present a new portion in which theheads of the nails will be formed. For limiting the movement of the die relative to the die-carrier I provide an eccentric screw 21 which projects into the annular recess 19 of the die, the occentricity of this screw making possible a limitin adjustment. A. lock-nut 22 serves to hold the screw in adjusted position. A friction spring 23 is also mounted in this annular recess to insure a certain degree of friction between the die-carrier and the die. This prevents accidental movement of the die.

The operation of the device is as follows: A blank is gripped between the jaws 6 and 7 leaving the end to be headed extending a certain distance beyond the face of the jaws. The heading lever is moved forward and the die 9 engages the face of the jaws 6 and 7. Upon continued movement of said lever the heading pin 10 which is held securely in the die-carrier engages the head of the blank and compresses the metal forcing it to expand to fill the recess of the jaws and the end of the die. Upon withdrawal of the heading lever the die will be held in its forward position by the friction of the head which has just been expanded to fill the die until the eccentric pin engages the side ofthe slot in said die whereupon the die will be drawn off from the head of the pin and moved backward. The jaws will then release the blank and a new blank will be inserted between the dies. The friction spring 28 will prevent the die taking an improper position due to the vibration of the machine. When the die becomes worn it may be ground 'oii sufficiently to present a new portion. In this manner the equivalent of a new die is pro vided and a single die may be ground many times obviating the necessity of replacing dies frequently and a single die may be used for several months. A new wearing surface on the heading pin is obtained by grinding in the same manner.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A heading tool comprising a die carrier having a cylindrical bore in its forward end, a centrally bored cylindrical die having an annular recess and mounted for longitudinal movement in the bore of the die-carrier, a friction spring mounted in said annular recess and pressing against the bore of the die carrier to resist relative movement of the die and die carrier, and a heading pin secured in the die carrier and extending into the bore of the die.

2. A heading tool comprising, a die carrier having a cylindrical bore in its forward end, a longitudinally bored cylindrical die having a sliding bearing in the bore of the die carrler, the length of the bearing being greater than the diameter of the bore of the carrier, a tapered split holder fitting within the die-carrier and a heading pin secured in the die carrier by said holder and slidable in the bore of the die the adjacent ends of the holder and die being telescopically connected whereby possibility of deflection of the unsupported portion of the heading pin extending between the holder and the movable die is minimized.

A heading tool comprising a die carrier having a cylindrical bore at its forward end, a. longitudinally bored cylindrical die having a long sliding bearing in the bore of the die carrier, a tapered holder longitudinally split at one end to provide a plurality of flexible members, and a heading pin secured in the die carrier by said holder and slidable in the bore of the die, the adjacent ends of the holder and die being telescopically connected whereby possibility of deflection of the unsupported portion of the heading pin extending between the die carrier and the movable die is minimized.

4. A heading tool comprising a die carrier, a tapered split holder mounted in the die carrier and having a solid cylindrical head, a heading pin mountedin the holder and a die movable in the die carrier and having a sliding bearing on the cylindrical head of the holder whereby the die is rigidly guided to move in a straight line avoiding transverse strain on the heading pin.

5. A heading tool comprising a die carrier liaving a cylindrical bore at its forward end and a tapered bore adjacent thereto, a tapered split holder having a solid cylindrical end, the tapered portion of said holder fitting tightly in the tapered bore of the die carrier, a longitudinally bored cylindrical die slidable in the cylindrical bore of the die carrier and bored at its end to fit slidably over the cylindrical end of the split holder, a heading pin secured tightly by the split holder and slidable in the bore of the. die and means to limit the movementof the die relative to the die carrier.

In testii'nony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ALBERT H. BRIGHAM.

Witnesses MAURICE P. Lemmas, THoMAs J. DRUMMOND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

